Question for you master boilers - boil crawfish or crabs first?

LSU aquaculture dept put out a controlled study they performed several years ago. Salt purging crawfish has no advantage at all. It has several disadvantages. The study can probably be found online. As for crabs, as previously posted, they are not usaully muddy and can be rinsed off fairly easy. However you do it, invite me over and I'll eat my fill.